EQ presets are very subjective. What "Mr. Xyx" has for a metal preset may not be to your liking. With presets being so subjective, there is almost no such thing as a "across the board" preset. If you are interested in additional presets, from
TSGH > Winamp
Equalizer Q&A Guide...
Q: Where can I find more presets? Where can I find presets for other genres?
Otherwise, you might be more interested in a
DSP/Effect plug-in to enhance the sound. IMHO, the aptly named
Enhancer is one of the best. I am not a big user of DSP/effect/enhance plug-ins, however Enhancer does have nice quality and has a lot of features for a free plug-in. Like EQ presets, DSP/effect/enhance plug-ins are subjective.
Good Luck and Happy Winamping